Javascript WinRT-在通用应用程序中启动/注册IBackgroundTask

我想在应用程序启动时启动IBackgroundTask

我已经将我的任务添加到了.appxmanifest.xml文件中，现在我的扩展名标记如下所示

<Extensions>
  <Extension Category="windows.backgroundTasks" EntryPoint="CordovaApp.Library.UploadTask">
    <BackgroundTasks>
      <Task Type="systemEvent" />
      <Task Type="timer" />
    </BackgroundTasks>
  </Extension>
</Extensions>

我已将此项目的引用添加到我的通用运行时组件项目中

一切都很好

现在要启动应用程序，我想我必须使用WinJs，所以我有以下代码

var uploadTaskName = 'UploadTask';
var tasks = Windows.ApplicationModel.Background.BackgroundTaskRegistration.allTasks;
var uploadTaskFound = false;

for (var i = 0; i < tasks.length; i++) {
    if (tasks[i].Value.name == uploadTaskName) {
        successCallback();
        return;
    }
}

Windows.ApplicationModel.Background.BackgroundExecutionManager.requestAccessAsync().then(function() {
    var builder = new Windows.ApplicationModel.Background.BackgroundTaskBuilder();

    builder.name = "Upload Task";
    builder.taskEntryPoint = "CordovaApp.Library.UploadTask";
    builder.setTrigger(new Windows.ApplicationModel.Background.TimeTrigger(15, false));
    return builder.register();
}).done(function () {
    successCallback();
}, function(err) {
    errorCallback(err);
});

var uploadTaskName='UploadTask'；
var tasks=Windows.ApplicationModel.Background.BackgroundTaskRegistration.allTasks；
var uploadTaskFound=false；
对于（变量i=0；i

现在requestAccessAsync方法总是抛出

0x80004005-JavaScript运行时错误：未指定的错误 WinRT信息：应用程序不支持锁定屏幕

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注册的所有东西都正确吗？我通过Visual Studio 2013在笔记本电脑上运行此功能

似乎因为应用程序已经安装，所以没有授予权限

通过卸载应用程序并重新运行它，系统会提示我允许/不允许后台服务运行。选中“允许”，现在似乎可以工作了

检查是否有帮助

var uploadTaskName = 'UploadTask';
var tasks = Windows.ApplicationModel.Background.BackgroundTaskRegistration.allTasks;
var uploadTaskFound = false;

for (var i = 0; i < tasks.length; i++) {
    if (tasks[i].Value.name == uploadTaskName) {
        successCallback();
        return;
    }
}

Windows.ApplicationModel.Background.BackgroundExecutionManager.requestAccessAsync().then(function() {
    var builder = new Windows.ApplicationModel.Background.BackgroundTaskBuilder();

    builder.name = "Upload Task";
    builder.taskEntryPoint = "CordovaApp.Library.UploadTask";
    builder.setTrigger(new Windows.ApplicationModel.Background.TimeTrigger(15, false));
    return builder.register();
}).done(function () {
    successCallback();
}, function(err) {
    errorCallback(err);
});